Application of the geometrical theory of diffraction to Cassegrain subreflectors with laterally defocused feeds

The geometrical theory of diffraction (GTD) as formulated by R. G. Kouyoumjian has been applied to predict the radiation characteristics of hyperboloidal subreflectors with laterally defocused feeds. In caustic or multicaustic directions the scattered fields are. determined AZIMUTH ANGLE Fig. 7. Smoothed theoretical and measured radiation patterns of pyramidal horn reflector antenna with blinders in 4, 6 , and 1 1 GHz bands. GTD prediction -. Measured -. Manuscript received October 10, 1974; revised March 17, 1975. 0. SBrensen is nrith the Electrotnametics Institute, Technical University of Denmark, Lyngby, Denmark. sity of Denmark, Lyngby, Denmark, on leave from the Department of W. V. T. Rusch 1s with the Electromagnetics Institute, Technical UniverElectrical Engineering, University of Southern California, Los Angeles, Calif. Authorized licensed use limited to: Danmarks Tekniske Informationscenter. Downloaded on October 9, 2009 at 07:12 from IEEE Xplore. Restrictions apply.